Uh, scarcity? Uh, price system?
It’s pretty simple: when (if) we start to get low on helium, the price will go up. Presumably the scientists will be better able and more willing to pay more for it than those who would put it in party balloons. Voila, problem solved.
How come seemingly intelligent people have such a hard time understanding scarcity and the price system? The price system is a whole lot simpler than superconduction or the Quantum Hall Effect. And yet…